RasGAPs supply a catalytic residue, termed the arginine finger, into the active site of Ras thereby stabilizing the transition state of the GTPase reaction and increasing the reaction rate by more than one thousand-fold, in good agreement with the structure of the RasṁRasGAP complex.
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Ahmadian, M., Stege, P., Scheffzek, K. et al. Confirmation of the arginine-finger hypothesis for the GAP-stimulated GTP-hydrolysis reaction of Ras. Nat Struct Mol Biol 4, 686–689 (1997). https://doi.org/10.1038/nsb0997-686
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DOI: https://doi.org/10.1038/nsb0997-686
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